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space-borne electronic equipments. Experimental results are presented, to verify
the effectiveness of the proposed classification method.
2 Experimental Set-Up
2.1 Test System
The data used in this work were collected from PIND automatic detection sys-
tem as shown in Fig. 2. With a high-power vibrator, vibrations make the par-
ticles to collide with the walls of the space-borne electronic equipment. The
collided energy is released in the form of elastic wave propagating along the
walls. Four acoustic sensors mounted on the walls convert the collision signal
into electronic signal. After amplification and data acquisition, the electronic
signals are recorded by a computer. The broad bandwidth acoustic sensors were
previously calibrated using an absolute capacitive transducer. The sensor is fol-
lowed by a 10 kHz high pass filter and a main amplifier. The system bandwidth
is from 10 kHz to 200 kHz with the gain of 60 dB. With four channels data
acquisition card, acoustic emission (AE) signal is digitized at a sampling rate of
500 kHz before being stored on disk. This system satisfies the measurement of
particle collision signals.
Fig. 2. Photo of the experimental system
2.2 Test Condition
The experimental objective is a rectangular space-borne electronic equipment
with a size of 150 mm
100 mm in dimensions and the wall thickness
is 2 mm . In order to carry out the experiments, three different material particles
×
120 mm
×
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